Rotary cutter



(No Model.)

A. E. STIRGKLER.

' ROTARY CUTTER. No. 284,086. Patented Aug 28, 1888 UNITED STAT S PATENT OFFICE.

ALBERT E. STIROKLER, OF WORCESTER, MASSACHUSETTS, ASSIGNOR TO HIMSELF AND JOHN D. STIROKLER, OF SAME PLACE, AND ANDREIV EPPLER, JR, OF BOSTON, MASSACHUSETTS.

ROTARY CUTTER.

SPECIFICATION forming part of Letters Patent No. 284,086, dated August 28, 1883.

Application filed-April 28, 1883. (No model.)

To aZZ whom it may concern Be it known that I, ALBERT E. STIROKLER, of \Vorcester, in the county ofNVorcester and State of Massachusetts, have invented certain Improvements in Rotary Cutters, of which the following is a specification,

This invention relates to rotary cutters particularly designed for trimming the edges of boot or shoe soles, and composed of a series of molded cutting-teeth secured to or formed. on a rotary hub or center.

The invention has for its object to provide certain improvements in the construction of this class of cutters, whereby they are enabled to operate to better advantage than heretofore.

My invention consists in the improvements which I will now proceed to describe and claim.

Of the accompanying drawings, forming a part of this specification, Figures 1 and 2 rep resent, respectively, side and edge views of a blank from which one form of my improved cutter is made. Fig. 3 represents a side view of a cutter made from said blank.

The same letters "of reference indicate the same parts in all the figures.

In carrying out my invention I form a polygonal blank or body, a, having any desired number of sides, each of which is molded transversely to the shape it is desired to impart to the article to be trimmed. Through the body I bore a series of transverse holes, I), corresponding in number to the sides in the perimeter of the body. From each hole I cut a slot, 0, extending diagonally to the perimeter of the body, one side of each slot intersecting the perimeter of the body at the angle formed by two of the faces of said perimeter, and forming the front surface of a cutting blade or tooth, (I, while the other side intersects the perimeter of the body at a point between the ends of one of said faces, and constitutes the back of another tooth, d. It will be seen, therefore, that the cuttingedge 2 of each tooth is farther from the center of the body than the heel 3,

this difference in distance giving the tooth the necessary clearance in cutting. It will also be seen that the heel 3 of each tooth, when made nearer the cutting-edge of the succeedihg tooth than the cutting-edge of the tooth said material.

to which it pertains, is higher--i. 6., farther from the center of the body-than the central portion of the tooth between the heel and the cutting-edge. The heel 3 of each tooth is therefore caused to act as a guard to limit the depth of the cut by forcing the material being trimmed slightly away from the cutter after the cutting-edge of the same tooth has entered In other words, the heel of each tooth prevents the operator from press ing the material against the cutter to such an extent as to cause the teeth to enter the material too deeply, the work tobe trimmed being held and presented to the cutter by the hands of the operator, as usual in this class of machines. The orifices b are wider than the slots 0, and constitute recesses or enlargements in the inner side of said slots, which permit the free movement of a sharpening-tool along the side of each slot that constitutes the front side of atooth. The polygonal form of the body a gives the teeth their proper clearance, and 0bviates the necessity of any subsequent opera-' tionsuch as bending'backwardly or backing off to give the teeth clearance. The width of the slots 0' determines the relative height of each guard 3, and therefore the depth or rankness of the cut of each tooth.

It will be observed that a line drawn from the point to the heel of any tooth in my cutter, and parallel with either side of the cutter, is a straight line. This line, if continued beyond the heel of the tooth, will be above the point of the next succeeding tooth, or it may touch said point, but will never be below it. The succeeding tooth must not project beyond this line, because if it did it would have a tendency to eat into the work.

The gist of my invention is that the heel of each tooth, being 011 or above aline drawn from its point to the point of the succeeding one, shall serve as a guard to prevent such eat- 111g 111.

I have shown the teeth as separated by slots with parallel sides. This is a very good and convenient way to make them, and so made they may beeas'ily sharpened; but it is not absolutely necessary that the slots should have parallel sides.

In sharpening n1y cutter the heel, as well as must, if continued, pass above the point of the the point, of each tooth is usually cut away; succeeding tooth, as set forth.

but the periphery of each tooth remains al- In testimony whereof Ihave signed my name ways in a plane forming part of the boundary, to this specification, in the presence of two sub- 5 of a true polygon. scribing witnesses, this 25th day of April, 1883. I 5

I claima A rotary cutter whose perimeter is a true .ALBERT STIRGKLER' polygon divided by slots, as described, to form Witnesses: V cutting-teeth, so that a straight line drawn, as O. F. BROWN, 10 described, from point to heel of one tooth A. L. WHITE. 

